Electrical apparatus for working planing-machines and other reciprocating tools.



A. D. WILLIAMSON. ELEGTRIOAL AZ PARATUS FOR WORKING PLANING MACHINES AND OTHER BEGIPROGATING TOOLS.

APPLICATION FILED DEC. 11, 1908. 91 9 ,41 1 Patented Apr. 27, 1909.

4 SHEETS-SHEET l.

WWW/M A. D. WILLIAMSON. ELECTRICAL APPARATUS FOR WORKING PLANING MACHINES AND OTHER BBGIPROLATING TOOLS APPLICATION FILED DBO.11, 1908. 919,41 1 v Patented Apr. 27, 1909.-

I 4 SHEETS-SHEET 2. WW2 W B X E X B 1 Wm 57 x I 6 3 ]0 I 3 B I. 9 .6 34 I 517 i 5 Ll 0 L fi A W A. D. WILLIAMSON. ELECTRICAL APPARATUS FOR WORKING PLANING MACHINES AND OTHER EEGIPROOATING TOOLS.

APPLIOATION FILED 1030.11, 1908. 919,411, I A Patented'ApnZ'Y, 1909.

4 BEEET8SHBET 3.

A, D. WILLIAMSON. ELECTRICAL APPARATUS FOR WORKING PLANING MACHINES AND OTHER REGIPROOATING TOOLS APPLICATION FILED DEC. 11 1908.

Patented Apr.27, 1909.

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fUNrr'En STATES PATENT oFFron.

A LFRED DAVID WILLIAMSON, OF SHEFFIELD, ENGLAND, ASSIGNOR TO VICKERS SONS & MAXIM LIMITED, OF SHEFFIELD, ENGLAND.

ELECTRICAL -APPARATUS FOR WORKING- -PLANINGMAGHINES AFID OTIIEIC REGIPRO- CATING TOOLS.

Specification of Letters Patent.

Patented April 27, 1909.

' Application filed December 11, 1908. Serial No. 467,006.

To all whom at may concern:

Be it known that I, AL RED 'DAV'ID Wu.- L'IAMsoN, a subject of the King of Great Britain, residing at River Don Works, Shef- 5 field, in the county of York, England, have" invented certain new and useful Improvements'in Electrical A paratus for Working Planing-Machines an other Reciprocating Tools, of which the following is a specification.

This invention relates to electrically actuated planing machines and other reciproeating tools that work with a comparatively 1 slow cutting stroke and a quick return stroke. I have already used machines of this kind in which the electrical apparatus comprised a reversible-variable spec electric motor controlled by a reversing switch and a starting switch which were mechanically operated fromthe reciprocating member 'or table of' th'e'plani'n machine and controlled-circuits by which e motor was successively worked at a suitable slow speed for'eflecting the cutting stroke of the machine, was retarded and reversed at the end of such stroke, was restarted and worked at a quick speed for efi'ecting the return stroke of the machine, was retarded'and-again re versed at the end of such stroke and restarted at the slow speed ,30 to effect another cutting stroke and so on,

the reversal and restarting of the motor being always made in a strong magnetic field and the various operations taking lace auto- .matically in proper sequence so ong the machine continued at work.

Ac'cording to my present invention 1 still employ a' reversible variable speed. electric motor which erforms the various functions L imcntioned' a ove, but instead of I using 40 switches operated h y mechanical means from the reciprocating table of the planing machine I employ a combined reversing andstarting switch which is controlled electrically by means of 'two solenoids which arealternately energized by current passing in circuits controlled by a master swit'ch that receives its movement from the reciprocating table of the planingmachin'e. Thesaid combined reversing and starting switch has an oscillatory contact arm Winch under the 1n- -fliuence of "spring pressure or equivalent means tends to assume an intermediate position for'siiort circuiting the armature throu h the stattingresistance and which undert e [influence of the solenoids moves from its the completion of its movement from the lnteri'ner late position in eitherdlrcctlon also operatessuitable mechanism for inserting a speed regulating resistance in the shunt field winding'during the quick return stroke and for removing said resistance or the main part of it during the cutting stroke. 7

I will describe my invention more fully with reference to the accompanying 'drawings, in which Figure 1 is a diagrammatic View showingthe various circuits and connectionsv of the electrical apparatus. in detail the construction of the combined starting and reversing switch; Fig. 2 being a plan Fig. 3 a horizontal section on the line 1, 1; Fig. 4 a vertical section on the line 2, 2; Fi 5 a horizontal section on the line 3, 3 of Fig. 3; and Figs. 6, 7 and 8 detail views of certain hammer switches hereinafter referred to. Fig. 9 is a diagram illus-,. trating the condition of the circuits at the various steps in the operation of the apparatus.

Referring first more particularly to Fig. 1

'A is the combined starting an reversing switch. B B arethe solenoids controlling said switch. trolling the solenoid circuits.

and I) is the'starting resistance. E is the Figs. 2 to 8 illustrate C is the master switch conshunt field winding, and Fis the armature. i

E is the speed regulating resistance which is adapted to he setinto the desired position for introducing more or less resistance in the shunt winding E of the motor according to the speed at which the cutting stroke of the machine is to be eilccted. The said combined startin and reversing switch comprises the osci latory contact arm a. and two concentric series of fixed contacts symmetrically arranged on eit her side of a vertical line, the starting contacts on the left. coming into action when the planing machine is working in one direction and those on the rightcoming into operation when the planing machine is working in'the other direction.

segmental pieces f connected with the motor armature F. The (inter seriesconsist of various segmental pieces of whichthose marked (1 d 'd d are connected with the series field windings, the contact pieces cl} being alsoconnected with the negative main the contact pieces (1 are connected with the positive main and those marked (1 are connected' with the starting resistance D through the contacts d d.

The solenoids B B have the contiguous ends of their windings connected with a hammer switch 6', the fixcdeontact of which is connected with the fixed contacts (1 of the combinedjstarting and revers" (1 switch A; this hammer switch 6' is actuate mechanically by the combined starting and rewrsing. switch and controls a resistance b forming part of the solenoid circuits. The outer ends which it lies on a horizontal line Joining the ever does not interfere with the prompt reof the solenoid windings are res ectively connected with the fixed segmenta contacts a c of the master switch C. [This master switch also has another fixed se mental contact a which is connected with t e-fixed contact of a mechanically actuated hammer switch c. This master switch has a switch arm e which is mounted on an axle c that carries another arm a. This lat-terarm is con led to 'a sliding block 'on the laning mac ine by a rod 0' and as this sli ing block is moved to and fro by the action of tappets on the reciprocating table of the planing machine as is well understood,- the said arm c (to-- gether with the switch arm 0) is caused to oscillate about the axis of the axle c. A

short arm a is also provided on the axle for lifting the hammer switch 0 when the switch arm 0 moves toward the right, the said hammer switch closing a ain under the influence-of a spring when tie said'switch arm moves towardthe left. The core of the solenoids B B is'connected mec'hanica lly with the contact arm a of the combined starting and reversing switch, so that when one of the solenoids is energized the said core moves the contact arm a, in one direction away-from its intermediate position in two fixed contacts d", d and when the other solenoid is energized the core moves the said contact arm in the o posite direction from its intermediate POSltlOIl. The said contact arm returns promptly to its intermediate' position under the influence of springs when the solenoids are not energized. 'l he movement of the said contact arm when under the influence of either of the solenoids, is retarded by a dash pot device which howturn of the contact' arm to the intermediate position when the solenoids are not energized.

e e are other hammer switches which are also actuated mechanically by the combined starting and reversing switch and control the speed regulating resistances E that are winding E of the motor. These hammer switches a e and the other hammer switch 6 are all poened at the completion of the movement 0 the contact arm a in one direction i of the reciprocating table of the planing machine), hut-only the hammer switches c and b are opened at the completion of the movement of the contact arm a in the opposite direction, (corresponding with the slow cutting hereinaltcrmore fully explained.

diate iosition' which it assu mes when the cireuit tnrou h the solenoids is broken by the master switch C, the armature is short-cireating .table of the planing machine, and moved toward the left into theposition shown 1 in Fig. 1, itsswiteh arm c connects the fixed cont-acts cc and thus permits current to )ass from the positive main through the wire t0 the hammer switch 7) (which at this time is closed) and thence, through the wire I), to the winding of the solenoid l3, whence the current passes, by the wire I), to the contact 1: :iiidtlirough the switch arm 0 to the contact c"; from this contact. the current passes through the short wires" to the li.\ 'cd eonwire I), to the lixed contact of the hammer switch etand tl1cncc through the wire If, to f the negative main. 'l'he solenoid l3 being thus energized causes the contact arm (1' to commence moving away from its intermediate position and to act upon the four lefthand contacts (1 1/" d (.1 in succession. On reaching the first of these contacts viz: d, the circuits and connections are as shown in Diagram 1 of Fig. 9; that is to say current Q passes from the positive main through the right hand contacts cl, f; the wire f the armature F, the wire f, the leftiiand'contacts f d, the wire at, the series field windings D D, the starting resistance D, the series field windings D D, the wire 11, the left hand contact (1 and thence to the negative main. At this time current from the posil tive main also iasses from the wire 6 through the shunt iieh winding E, the wire e and to the wire If and thence to the negative. main. The shunt held winding is thus at this time l'ully excited, no resistance being- The said switch arm inserted in its circuit. a in (:mitinuing its movement mores slowly over the next three left hand contacts (F (l 4* and by so doing cuts out from the armature When the contact arm a is in its internie the hammer switches a e (which are closed) inserted at the proper times in the shunt- (corresponding with the quick return stroke stroke of-the reciprocating table) as will he enited through the starting resistance D, the shunt Iield winding E -is full} excited, the' the quick return movement of the reciprotact of the hammer switch r,' thence, by the circuit, first the two ser-iss field coils D 1)" (see Diagram 2 of- Fig. 9), then the starting resistance D (see Diagram 3 of Fig. 9) and finallythe remaining two series field coils D I) (see Diagram 4fof Fig. 9). The switch 2 arm a then occupies. the osition in which it is shown in Fig.,1 in w ich the armature is connected directly across the mains and the machine performs the slowcutting stroke. As the said switch arm (1 reaches this position it causes the two hammer switches b and e to open. The effect of opening the switch I) is to insert the-resistance b"in the winding of the solenoid B, so as to reduce the heating effect of the current after the said solenoid has performed the work of moving the said switch arm. The opening of the switch e has the effect of insertingin the shunt field circuit E the proper amount of initial'resistance to which the s )eed regu-- lator E has been previously set or obtaining the required degree of speed for the slow through the wire 2, the shunt winding E and- C toward the right.

' ment.

cutting stroke of the ,machine depending upon the nature of the work under treat- VVhen this switch (2 is thus opened, the current passes from the positive main the wire e to the fixed contact of the said switch e, thence through the wire ef, the small amount of resistance e, the wire e the hammer switch e (which is closed), the wire I. and thence to the-negative main.

v The contact arm (0 remains in this position (Fig. 1) until the cutting stroke is nearing completion, when the tappet mechanism on the reciprocating table of the planing machine moves the arm a of the master switch As the said arm cin performing this movement reaches a neutral position between the two contacts 0 c in which these contacts are broken, the circuit through the winding of the solenoid B is also broken. The said contact arm a being there- 'fore no longer held by the influence of the solenoid in the position in which it is shown in Fig. 1, promptly returns under the influence of its springs or'equivalent means to the intermediate position in which it joins the contactsf and 11-", thus short-circuiting the armature F through the resistance D and stopping its rotation by the .hraking effect of the strong magneticiield. As the said contact arm a resumes this intermediate position, it also permits the hammer switches b and e to close again, thus cutting out the resistance b" from the solenoid circuit and the speed regulating resistanee-e from the shunt field circuit and obtaining the maximum strength of magnetic field for stopping the rotation'of the armature as ,aforesaid, prior to. the'reversal of its direction of rotation (see Diagram 5 of Fig. 9). The said arm 0 of the master switch in continuingv its aforesaid movement to the right reaches a position in which the contacts 0 c are joined, whereleft hand solenoid B in the opposite directhe two left handcontacts f and d and the four right hand contacts d dd d. The current through the armature circuit is thus and to the contacts (1 d d and d in succession, and back to the negative main, thus cutting out the series field coils and the starting resistance as before (see Diagrams 6, 7 and 8 of Fig. 9). As the said contactarrn a completes this movement it opens the three hammer switches b, e and e The opening of the hammer switch 1) causes the resistance 1)" to he inserted in the winding of the solenoid B as in the case when the right hand solenoid was energized. ."lhe opening of the -to pass from the positive main through the wire 6, the shunt winding E, the wire e the wire a the whole of the speed regulating retion until the reciprocating table of the planing machine approaches the completion of its quick return stroke, whereupon. the arm 0 of the master switch 0 is moved'toward the left by the tappet mechanism and in so closes the contactsc c for recommenemg a 1 fresh cycle of operations. The efiect'of closing the hammer. switch .0 is to cut-out the bulk of the speed regulating resistance from the shunt field circuit, by reason of the'nurrent sistanee E the wire a, the wire '2", the closed arm a then moves under the influence of the reversed, passing fromthe positive main to the left hand contacts 01,], then through the wire f the wire f, the right hand contact f two hammer switches e (2 has the effect of. causing the current in the shunt field circuit fixed contact of the hammer switch 0, the

sistances of the speed regulator Ex, thence through the wire e, the fixed contact of the (see Diagram 9 of Fig. 9). The said. contact arm a remains in the aforesaid posimoving first permits the hammer switch .0 t0

close, then breaks the contacts 0. c and the circuit through the left hand solenoid B and v 120':

being then able to pass from the wire-e of p the shunt field circuit through the fix d r onffF- tact of the hammer switch e,'=tl 1e wire a, the} small portion eof the speed regulating r e-' upon the current passes from the positive tion to that aforesaid and travels slowly over 1 hammer switchc, the wire it); the fixt 'cone r tact of the hammer switch 6 to the wire 12'' and thus tothe negative main. This operationltakes place a fraction of time in ad-' vance of the return movement of the contact arm a, and occurs when the arm. of the master switch .leaves the contact 0 and breaks the circuit through the solenoid B, and therefore just before the hammer switches lye, e close again under the action of the said contact arm a-. An. earlier strengthening of the shunt field of the motor spindle (1. -upon the outer end of which is or casing A within which are is thus obtained and consequently a more ready reversal of the motor, than would otherwise be the case (see Diagram 10 of Fig;

9). As the said contact arm 0. thus returns to its intermediate position joining the contacts f and d, and permits the hammer switches b e and e to again close, the circuit. through the armature F .is short-cir'cuited through the resistance 1) as before and the armature comes to rest in a strongmagneti'c field, preparatory to being reversed, whereupon the said contact arm'iz moves in the opposite direction to cause a fresh cutting stroke of the machine(see' Diagram 1-1 of Fig. 9). l

I will nowdescribe the constructional form of the combined starting and reversing switch shown by Figs. 2 to 8'. It comprises a mounted the contact arm a. This arm carlies at its extremities holders for the carbon contacts-which bear upon the aforesaid two series of stationary contacts that are fixed to the, plate A of slate 'or other insulating material. This plate A is situated above a box arranged the two -,solenoids B B and the resistance t (Fig. 5). The inner end of the said spindle a, carries a toothed wheel or segment a, which gears with rack teeth b formed on the middle part of the solenoid core B. To the lower side of the said toothed segment a is attached a cam plate a which is in the form of a flanged ring having in its-flanged port-ion two inclined or inverted V-shaped recesses. against the walls of which bear a pair of s )ring rollers a (1, whose function is to cause t 1e said spindle a and its contact arm a to always assume the proper intermediate position hereinbefore stated, when the solenoids are inactive and the said spindle, is being returned by the springs 11" (F ig. 4). These springs are connects-l at their inner ends to the opposite sides of the said cam plate at a a. and at their outer ends are connected to the box or casing A by means of adjustable eyes The aforesaid solenoids tubular barrels B (Fig. 3) fitted therein and the ends of the core B are furnished with cup loathe-is 13*" that work in said barrels; like pump pistons. The end covers 13" of the solenoids have inwardly projecting bosses B that fit.into the outer ends of the said barrels B. These bosses are perforated and have screw-threaded cavities to receive air B" have valves B adapted to admit air to the interior of the barrels B more freely than it can escape, thus constitutin the dash pot device for causing the solenoid core B to move slowly while the contact arm a is moving to one or other side of its intermediate position position under the action of the springs a arm a, the core B hes in the position shown On the said core moving say to the ri htun der the influence of the solenoid B, t 1e said core sucks in air throu h the left hand .valve by the liftin of the ball 8 and the consequent of the r1ght hand valve remains closed durin' ter freely in front of the right hand end of the core, through the lifting of the ball B 'of the right handvalv'e. 1f the core be moved to closed so that the air has to. be forced slowl' through the contracted passage 13 of this valve, while air is able to enter freely through the right hand valve by lifting the ball I 8 of such valve. hen the solenoid B becomes inactive the said core returns quickly under the action of the sprin s a be cause the air in front of the ri ht hanil' end of the core can freely pass out y the hole B and air-can at the same time enter freely in front of the left hand end of the core'through fixed a disk (1, having therein a segmental slot 0 (Fig. 2) with which a pin a engages. This pin is carried by a link a, winch 1s works. To the other end of the said lover a." i hinged an arm a which is coupled to a crank (1) carried by a transverse rocking, shalt a" mounted in hearings on the insu lated plate A. At its-opposite ends this rocking shaft has stirrup pieces a which lie beneath the aforesaid hammer switches e e, and/1. The hammer switches e e are hinged to a shaft e and the hammer switch b is hinged to a shaft 13".. When the rocking shaft c" is rocked in one direction, it will, by means of the stirrup pieces, lift all of the said 2 hannner witches against the resistance of l springs with which the latter are provided.

opening of t 1e passage B, but as the ball B? -this movement the air at the right hand en' I ward the left by the influence of thesolenoid B the ball B of the left hand valve remains the liftingof the ball B of the left hand valve; Near the outer end of the said spindle a is a and to move quickly'when returning to that n the intermediate position of the contact -in Fig. 3, with aspace at each of its ends.

hole B and that air can at thesame time enhing d to one end 'of alcver a. This lever is n'iounted on a stationary pn'ot a earnedbyjlie socket a in which the spmdle '0 When the said shal t (1." is rocked in the oppois effected by the ends of the slot a in t] re d islc' a acting upon the pin a" of the link a".

. 'mcans tending to cause said contact arm to contact arm to move from its intermediate pieces that lie beneath corresponding fingers 'pletes its angular movements in either direcversible variable speed electric motoi, of a movement from .the reciprocating table of ciprocating tools; the combination with a. ro-

.controlling the series field windings and the the main site direction it will-lift the. hammer switches a a d?) without affecting the hammer switch a, this result being obtained [2 providing 1 the-said' hammer switches e an 6 with tail 9 or lugs a" (Figs. 6 and 7) on the said rocking? shaft. The rocking motion of the said shaft 3 The said slot occupies a central, position with respect to thesaid pin when the contactarm a is inthe intermediate position and acts upon theas one or other of its ends comes against tiie s'aid pin, when the arni a cointion.

What I claim anddesire to secure by Letters Patent of the United States is 1. In electrical apparatus for automatic-' ally working planing machines and other reciprocating tools; the combination with a recombined revcrsing and starting switch controlling the circuits by which the motor is caused to change its revolution and speed for effecting in one directionthe slow cutting stroke and in the other direction the quick return stroke, electrical means for actuating the aforesaid combinmlreversing and startsw'itch, and a. master switch receiving its the planing machine for controlling the circuits appertaining to the aforesaid electrical means.

2. In electrical apparatus for aiil.oin.-r.tic ally working planing machines and other reversible variable speed elcctric -n'\otor, -a starting resistance and a speed regulating resistance, of a'combined reversing and slarli ing switch having an oscillator contact arm,

assume an intermediate position for short cireuitmg the armature through the starting resistance, electrical means for causing said position in alternately opposite directions for direction of the current in the circuit of the armature. of the aforesaid motor, means actuated on theeompletion of the movement of the aforesaid arm from its intermediate position i-neitlier direction for inserting the speed regulating resistance in the shunt field windingof the motor duringthequiek-return stroke and for removing said resistance or art thereof during the cutting stroke, an a master switch receiving its movement from the reciprocating table of the A planing machine for controlling the circuits appertaining to the aforesaid electrical means. I

3. In electrical apparatus for automatically working planing machines and other re-' eiproca-ting tools; the combination with a reversible variable speed electric motor, a starting resistance and a speed regulating resistance, of a combined reversing and start- D ing switch having an oscillatory contact arm,

springs tending to cause said contact arm to assume an intermediate position. electrical means for causing said contact arm to move from its intermediate position in alternately opposite directions, means actuated on. the completion of the movement of the aforesaid arm from its intermediate position in either direction for'inserting the speed regulating resistance in the shunt field winding of the motor during the quick return stroke and for removing said resistance or the main part thereof during the cutting stroke, and a master switch receiving its movement from the reciprocating table of the planing machine for controlling the circuits appertaining to tiniaforesaid electrical means.

4. In electrical apparatus for autoinat1cally working planing machines and other reciprocating tools; the combination with a reversible variable speed electric motor, a, starting resistance and. a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm, a spindle to which said contact arm is secured, spril'lgs attached tooppositely situat-ed points relatively to said spindle and tending to cause said contact arm to assume an. i ntermedi ate posit-ion, electrical means for ca using said contact arm to move from its intcrnn-diatc position in. alternately opposite directions, means actuated on the completion of the movement of the aforesaid arm from its intermediate position in either lirection for inserting the speed regulating resist sure in the shunt. field winding of the motor during the quick return stroke and for-removing: said resistance or the inain part thereof during the cutting stroke, and a master switch receiving its movement: from the reciprocating table of the planing'machine for controlling the circuits appertaining to the aforesaid electricalmeans.

5. In electrical apparatus forflrutomatically working planing machines and other reciprocating tools; the combination with a reveisible variable speed electric motor, a starting resistance and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm, a spindle to which said contact arm is secured, a cam-plate attached f to said spindle, springs attached at 0 posite points on said ram-plate and ten mg to' cause said contact arm to assume an inter mediate positioi'i, spring controlled rollers engaging with the cam plate for causing said cam plate, spindle, and contact arm, to

assume tieir true intern'iediate position' when moving under the influence of the" aforesaid sprmgselcctncal means for caus ing'said contact arm to move from its inter i l i l mediateposition in alternately opposite directions, means actuated on the completion of the movement of the aforesaid arm from its intermediate position ineither direction for inserting the speed regulating resistance 1n the shunt field winding of the motor during the quick return strokeand for removing said resistance or the main part thereof during the cutting stroke, and a master switchreceiving its movement machine for controlling the circuits appertaining to the aforesaid electrical means.

6. In electrical apparatus for automatically working planing machines and other reciprocating tools; the combination with direction, means actuated on the 'coriipletion of the movement of the aforesaid arm from its intermediate position in either diresistance in the shunt field winding of the motor during the quick return stroke and for removing said resistance or the main part thereof during the cutting stroke, and

rectionfor inserting the speed regulating a master switch receiving its movement from the reciprocating table'of the planing machine for controlling the circuits appertaining to the aforesaid electrical means.

7. In electrical apparatus for automatically working planing machines and other reciprocating tools; the combination with a reversible variable speed electric motor, a starting resistance and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contactarm, means tending to cause said contact arm to assume an intermediate position, a pair of solenoids adapted to be alternately energized for causing said contact arm to move'from its intermediate position in alternately oiposite directions, means for enabling sai contact arm to perform its oscillatory movements sluggishly in. one direction and quickly in the other direction, means actuated on the completion of the movement of the aforesaid arm from its intermediate position in either direction for inserting the speed regulating resistance in the shunt iield winding of the motor luring tl" quick return stroke-and for removing said resistance, or the main part thereof during the cutting stroke, and a master switch receiving its movement from i i 11 i from the reciprocating table of the planing ally working planin the reciprocating table of the planing machine for controlling the circuits appertaining to the aforesaid solenoids.

8. In electrical apparatus for automaticmachines and other'reciprocating tools;t e combination with a reversible'va-riable speed electric motor, a starting resistance and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm, means tending to cause said contact arm to assume an intermediate positionpa pair of solenoids adapted to be alternately energized for causing said contact arm to move from its intermediate position in alternately opposite directions, a movable core common tosaid solenoids, gearing connecting said core to the contact arm, means for enabling said core to move sluggishly' when under 'the inilucnce of the alternately energized solenoids and to move quickly in its return, means actuatedgon the completion of the movement of the aforesaid arm from its intermediate position in either direction for inserting the speed regulating resistance in the shunt field winding of the motor during the quick return stroke and for removing said resistance or the main part thereof duringthe cutting stroke,

and a master switch receiving its movement from the reciprocating table of the planing machine for controlling the circuits appertaining to the aforesaid solenoids.

9. In electrical apparatus for automatic-- ally working planing machines and other reciprocating tools; the combination with a reversible variable speed electric motor, a starting resistance and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm, means tending to cause saidv contact 'arm to assume an intermediate position, a pair of solenoids adapted to be alternately energized for causing said contact arm to move from its intermediate position in alternately opposite directions, a movable core common to said solenoids, gearing connecting said core to the contact arm, a dash-pot devicefor enabling said contact arm to perform its oscillatory movements sluggishly in one direction and quickly in the other direction, means. actuated on the completion of the movement of the aforesaid arm, from its intel-mediate position in eitherdirection for inserting the speed regulating resistance in the shunt field winding of the motor during the quick return stroke and for removing said resistance or the main part thereof during the i cutting stroke, and a. master switch receiving l I l I 0 I 5 its movement from the reciprocating table 01 the planing machine for controlling the circuits appertaining to the aforesaid solenoids.

10. In electrical apparatus for automatic-- ally working planing machines and other reciprocating" tools; the combination with a greversihle variable speed electric motor, a

starting resistance and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm,

oids to. erform its oscillatory movements sluggish y in one direction and quickly in the other direction, means actuated on the com-' pletion of the movement of the aforesaid arm rom its intermediate position in either direction for inserting the speed regulating resistance in the shunt field winding of the motor during the quick return stroke and for removin said resistance or the main part thereo during the cutting stroke, and a master switch receiving its movement from the reciprocating 'table of the planing machine for controlling the circuits appertaining to the aforesaidsolenoids.

11. In electrical apparatus for automatically working planing machines and other v reciprocating tools; the con'ibination with a reversible variable speed electric motor, a

startingresistance and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm, means tending to cause said contact arm to assume an intermediate position, a pair of solenoids adapted to he alternately ener-- gized for causing said contact arm to move rom itsintermedlate position in alternately opposite directions, a lliOViLblO core common to said solenoids, gearing connecting said core to the contact arm, tubular barrels situated within said solenoids and formed with air holes, pistons on thcportions of the aforesaid core where they work within said liarrels valves for retarding the movement of said of the alternately energized solenoids and for allowing the return movement to take place quickly, means actuated on the completion of the movement of the aforesaid arm from its intermediate position in either dircctionfor inserting the speed regulating resistance in the shunt field winding of the motor during the quick return stroke and for removing said resistance mathe' mam;

core while moving under the influence part thereof during the cutting stroke, and a i master snitch receiving its movement from the reciprocating tableol' the planing machine for controlling the circuit appertaining to the aforesaid solenoids.

12. In electrical apparatus for \rorkin w planing machines and other reciprocatin l l l a I l tending to cause said cont-act arm to assume an intermediate position, electrical means for causing said contact arm to move from its intermediate position in alternately opposite directions, an auxiliary switch which nori mally short circuits a part of the speed-regulating resistance, a second auxiliary switch which normallyshort circuits the whole of the speed-regulating resistance, means for actuating the first-mentioned auxiliary switch as the contact arm completes its movement 'from its intermediate position for the cutting stroke, means 'for actuating both auxiliary switches as the contact arm completes its movement for the quick return stroke, and a master switch receiving its movement'from the reciprocating table of the planing 'machine for controlling the circuits appertaining to theaforesaid electric ll means.

13. In electrical apparatus for automatically working planing machines and' other reciprocating tools; the combination with a 'reversible variable speed electric motor, a

starting resistance and a speed regulating resistance, of a combined reversing and start ing sn' itch having an oscillatory contact arm,

a spindle to which said contactarm is seowed, a slotted disk fixed to sald spindle, means tending to cause sald spindle and contact arm to assume an intermediate position,

electricab means for causing said contact arm to move from its intermediate position in alternately opposite directions, a hammer switch which normally short-circuits a part of the speed regulating resistance, a second hammer switch which norm'ally short-circuits the whole of the speed regulating re sistanc'e, a rocking shaft, link mechanism connecting the slotted disk on the spindle of the contact arm with said rocking shaft, an arm secured to said rocking shaft for act-n ating the first mentioned hammer sax itch as the contact arm completes its movement lot from'its intermediz'tte position for the cutting stroke, a stirrup piece also secured to said rocking shaft for actuating both hammer switches as the contact arm completes its movements for the quick return'strokc, anda master sv. itch receiving its movement from the reciprocating table of the planing machine for controlling the circuits appertaining to the aforesaid electrical means' 4. In electrical apparatus for automatically working planing machines and other reciprocating tools; the combination with a reversible variable. speed electric motor, a starting resist ance and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm, means tending to causesaid contact the completion of the moven'ien't of the conally working planing machines. and other rearm to assume an intermediate position, a pair of solenoids adapted to be alternately. energized for causing said contact arm to move from'its intermediate position in alternately opposite directions, a normally shortcircuitedresistance in thecircuitof said solenoids, means actuated on the completion of the movement of the aforesaid arm from its intermediate position in either direction 10 for inserting the speed'regulating resistance 4 in the shunt field winding of the motor durT ing the quick' return stroke and for removing said resistance or the main part thereof during the-cutting stroke, means actuated on tact arm from its intermediateposition in either direction for inserting the resistance inthe circuit 01 the solenoid that is for the time being energized, and a master switch 20 receiving its movement from the reciprocating table of the planing machine for coritrolling the circuits appertaining to the aforesaid solenoids.

15. Inelertrical apparatus for automaticeiprOcatingitools; the combination with a reversible variable-speed electric motor, a starting resistance and a' speed regulatin resistance, of a combined reversing and starting switch having anoscillatory contact arm, means tending to cause said contact arm to assume an intermediate position, a pair of'solenoids adapted to be alternately energized for causing said contact arm to move from its intermediate position in alternately opposite directions, a normally shortcireulted resistance inthe-circuit of the said solenoids, an auxiliaiy switch which normally short circuits a part of the spee l-regu- 40 latin resistance, a second auxiliary switch whici normallyshort ,circuits the whole of the speed-regulating resistance, a switch which normally short-circuits the resistance in the solenoid circuits, means for actuating 4 the first mentioned auxiliary switch as the contact arm completes its movement from itsintermediate position for the cutting stroke, means for actuating both auxiliary switches as the contact arm completes its movement for the quick return stroke, means for actuating the solenoid resistance switch as the-contact arm completes its movement from its intermediate position in either direction, and a master switch rem-iv,-

ing its movement iron. the reciprocating table-.oi' the planing machine for controlling the circuits' appertaining do the aforesaid solenoids.

i 16. In electrical apparatus for auton1::.lie-.

ally working planing machines and other rcciprocating tools; the combination witha reversible variable speed electric motor, a starting resistance and a speed regulating resistance, of a combined reversing and start- 6 iiigswitoh having an oscillatory contact arm,

a spindle to which said contact arm is sein alternately opposite directions, a resistance 1n the circuit of the said solenoids; a

hammer switch which normally short-circuits a part of the speed regulating resistance, a second hammer switch which normally short-circuits the whole of the speed regulating resistance, a third hammer switch which normally short-circuits the solenoid.

circuit resistance, a rocking shaft, link mechanism, connecting the slotted diskon thespindle of the contact arm with said rocking shaft, arms secured to said rocking shaft for actuating the hammers of the first and third mentioned hammer switches as the contact arm completes its movement fronrits inter-'- mediate a position for the cutting stroke, stirrup pieces also secured to said rocking shaft for actuating all the hammers of the hammer. switches as the-contact arm-completes its movement for the quick return stroke, and a master switch receivin its movement from the reciprocating table of the planing machine for controlling the current in the aforesaid solenoids.

17. In electrical apparatus for automatically-working planing machines and other reciprocating tools; the combination with a reversible variable speed electric motor, of a combined reversing and starting switch controlling the circuits by which the motor is caused to change its revolution and speed for eitecting in one direction the slow cutting stroke and in the other direction the quick return stroke, electrical means for actuating the aforesaid combined reversing and start-' mg sw1teh, a master. sw tch receiving its movement from the reciprocating table of the planing machine for controlling the circuits appertaining to the aforesaid electrical means, and an auxiliary switch actuated by said master switch for cutting out the greater part of the speed-regulating resistance immediately the aforesaid master switch-commences to be actuated by the .reciprocating table of the planing machine at the completion of the quick-return stroke.

18. In electrical apparatus for automatically working planing machines and other reciln'ocating tools; the combination with a reversible variable speed electric motor, a starting resistanw and a speed regulating resistance, of a combined reversing and starting switch having an oscillatory contact arm, means tending to cause said contact arm to assume an intermediate position, electrical Y means for causing said contact arm to move which normally short-circuits a part of the speed-regulating resistance, a second -auxiliary switch which normally short-circuits the whole of tl1e speed-regulating resistance, a 1 master switch receiving its movement from the reciprocating table of the planing machine for controlling the circuits appertaining to the aforesaid electrical means, and'an auxiliary switch actuated by said master? switch for cutting out the greater part of the t speed-regulating resistance immediately the aforesaid "master switch commences to be ac "tuated by the reciprocating table of the Planing machine at the completion of the from its intermediate position in alternately opposite directions, an auxiliary switch which normally short-circuits a part of the t speedregulating resistance, a second auxil- I iary switch which normally short-circuits the ;whole of the speed-regulating resistance,

means for actuating the first mentioned auxiliary switch as the contact arm completes its movement from its intermediate position for:

the cutting stroke, means for actuating both auxiliary switches asthe contact arm completes its movement for the quick return stroke, a master switch receiving its movement from the" reciprocating table of the planing machine for controlling the circuits appertaining to the aforesaid electrical means, andan auxiliary switch actuated by said master switch for cutting out the greater part of the speed-regulating resistance immediately the aforesaid master switch commences to be actuated by the reciprocating table of the planing machine at the completion of the quick-return stroke the first and switches return ing positions.

In testimony whereof I affix my signature in presence of two witnesses.

ALFRED DAVID WILLIAMSON.

and before second mentioned auxiliary to their normal short-circuit- Witnesses:

JNo. R. HECKLEY, W. G. MANN. 

